DOCSP-46651 - Add redirect and fix landing page (#152)

(cherry picked from commit f67214f)
(cherry picked from commit 5fbe828)

Author: mongoKart

config/redirects

@@ -8,3 +8,7 @@ raw: ${prefix}/ -> ${base}/current/
 raw: ${prefix}/stable -> ${base}/current/
 raw: ${prefix}/master -> ${base}/upcoming/
 
+# temporary redirect for a bad link
+raw: ${prefix}/get-started/download-and-install/ -> ${base}/current/get-started/download-and-install/
+
+[*-master]: ${prefix}/${version}/security/enterprise-authentication/ -> ${base}/${version}/security/authentication/

source/security.txt

@@ -34,7 +34,7 @@ This page contains code examples that show each of these mechanisms.
 .. tip::
 
   To learn more about any of the authentication mechanisms on this page, see the
-  :ref:`pymongo-auth` and :ref:`pymongo-enterprise-auth` pages.
+  :ref:`pymongo-auth` page.
 
 To use an authentication example from this page, copy the code example into the
 :ref:`sample application <pymongo-auth-sample>` or your own application.

source/security/authentication/kerberos.txt

@@ -168,7 +168,7 @@ to use Kerberos to authenticate.
 API Documentation
 -----------------
 
-To learn more about using enterprise authentication mechanisms with {+driver-short+},
+To learn more about using authentication mechanisms with {+driver-short+},
 see the following API documentation:
 
 - `MongoClient <{+api-root+}pymongo/mongo_client.html#pymongo.mongo_client.MongoClient>`__